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Permission sets in Salesforce

Permission set:

A permission set is a collection of settings and permissions that
give users access to various tools and functions.
Permission set enhances functionality of profiles,
Consider a scenario where only one user need access to "Case" object and he
belongs to some 'Sales' profile, then we need to modify that profile which
will affect other users with the same profile.

So, alternatively we can create a permission set with access to case object and assign that to that particular user.